Gamma band oscillation ranges from 30 to 100 Hz. It can be recorded in many brain areas such as somotosensory cortex, hippocampus and thalamus. The gamma band oscillation can be detected at different levels such as microscopic (spikes), mesoscopic (local field potentials, LFP) and macroscopic (electroencephalogram, EEG) level. GABAergic inhibitory interneuron network is considered as the main source of the gamma oscillation generation, and the cortical gamma oscillation is also related with the interaction of thalamo-cortical system. Gamma band oscillation is associated with sensory and cognition functions, in particular the feature binding, selective attention and memory processing.